There are two different ambient noise levels that are required to meet fire alarm audibility goals and system design. The first is the average sound pressure levels (SPL) during the time the area is occupied. The second is the maximum SPL that lasts a specific minimum duration of time (in seconds). Per NFPA 72, which of the following choices is the minimum duration required to meet the second ambient noise level?
lengocho
6 months agoyasern13
10 months, 2 weeks agoSaurabhootara
1 year, 2 months ago